For American patriots: When you think of your love for your country, what do you think of?

What exactly is it about the United States of America that warms your heart? Is it the principles laid out in the Constitution? Is it the diverse landscape of our country? Is it the people? Is it the culture? What is it exactly that makes you love your country? What makes you willing to even DIE for it? Also, do you think you feel the way you do, because it was instilled in you when you were a child, or is your sense of patriotism something that you have gained during adulthood?